The effects would last around three more weeks, maybe longer.

God knows how long the effect will last, but it can't be much longer.

The effects can last from a few hours to six days.

The effects can last for up to four to six hours.

"Just tell me how long I can expect the effects to last."

The effect takes more than 10ms to develop and can last for up to a few seconds.

Some effects may last for years and very probably are permanent.

"The effect of the warning might last a few weeks."

Unfortunately the effects of the great clean up did not last more than a few years.

"But the protective effect will only last for about a minute."